Mask



FIG. 1 is a top perspective view of a mask showing my new design shown in an open position;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a back perspective view thereof, with the head and neck of the human figure removed and the mask shown in a closed position;

FIG. 8 is a front elevation view thereof, shown in a closed position; and,

FIG. 9 is a perspective view thereof, shown in an open position.

The broken lines showing portions of a mouthpiece for a brass instrument, ear loops, and the head and neck region of a human figure, are included for the purpose of illustrating environmental structure and form no part of the claimed design. The broken lines shown on the surface of the mask show thread stitching and form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 